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STOCK INCENTIVE PLAN - Restricted Stock Narrative (Details) - Restricted Stock Units (RSUs) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period (years) | 3 years |  |
Unrecognized compensation expense | $ 14,404 |  |
Weighted-average period (years) | 1 year 7 months 28 days |  |
Fair value of shares vested in period | $ 10,751 | $ 18,017 | $ 17,878

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